南沙群岛珊瑚礁灰岩弹性波性质的研究

ELASTIC WAVE PROPERTIES OF CORAL REEF ROCK IN NANSHA ISLANDS

利用弹性波法对南沙群岛永暑礁南永一井的珊瑚礁灰岩岩芯和其它礁砂土样品进行了弹性波测量，根据测量结果，绘出了礁灰岩弹性波波速随深度变化的关系曲线，并结合永暑礁的发育演化历史、岩石学、地层学、沉积旋回以及古地磁测年，深入研究了弹性波纵波波速的变化规律，以及它与礁灰岩年龄、结构、岩石类型、孔隙度、沉积环境、地质事件的关系。研究结果表明，看似“异常”的弹性波纵波波速值恰是以上诸因素综合作用的结果。弹性波特性的研究在珊瑚礁地质研究中具有重要的意义。

An elastic wave technique is used to measure the properties of coral reef rock of core Nanyong 1 and other coral reef samples From the result the relation of wave velocity with depth is determined General trend of longitudinal wave velo city is studied from the development history,sedimentology, petrology,sedimentar y cycles and palaeomagnetic chronology The relation of longitudinal wave veloci ty with ages, texture and types of rocks, porosity, sedimentary environment of c oral reef rock, and geological events is analysed. It shows that anomalous value s of longitudinal wave velocity are the consequence of integrated effect of the se geological factors. The study of elastic wave properties is of important sig nificance in coral reef geology and can be used in the structural and stability analysis of coral reef.